Question 1

What is FlashVSR?

Accepted Answer

FlashVSR is the world's first one-step streaming diffusion-based video super-resolution framework, developed jointly by Tsinghua University and Shanghai AI Laboratory. It processes 768×1408 videos at 17 FPS on a single A100 GPU - 12× faster than traditional one-step diffusion models.

Question 2

How is FlashVSR different from other video upscalers?

Accepted Answer

FlashVSR employs three breakthrough innovations: a train-friendly three-stage distillation pipeline, locality-constrained sparse attention, and a tiny conditional decoder. These technologies enable unprecedented real-time processing speed while maintaining optimal visual quality and perfect frame-to-frame consistency.

Question 3

What video formats and resolutions does FlashVSR support?

Accepted Answer

FlashVSR supports mainstream video formats including MP4, MOV, AVI, and WebM as input. Output supports four resolutions: 720p, 1080p, 2K, and 4K, which you can select based on your needs. Maximum video duration per processing session is 10 minutes.

Question 4

How long does it take to process a video?

Accepted Answer

Processing time depends on video length and target resolution. In Full mode, processing 1 second of video takes approximately 3-20 seconds; Tiny mode is even faster. FlashVSR achieves 17 FPS real-time processing speed at 768×1408 resolution.

Question 5

What's the difference between Full mode and Tiny mode?

Accepted Answer

Full mode provides the highest quality output, ideal for scenarios requiring maximum visual fidelity. Tiny mode uses the tiny conditional decoder for faster processing (approximately 7× speedup) while maintaining high quality, perfect for real-time applications and rapid processing needs.

Question 6

How does FlashVSR ensure frame-to-frame consistency?

Accepted Answer

FlashVSR employs a streaming architecture with KV-cache mechanism to ensure temporal coherence. Locality-constrained sparse attention technology effectively avoids texture aliasing and visual artifacts, eliminating flicker and ghosting to produce smooth, crystal-clear ultra-HD footage.

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